디에르치과의원 (DIER Dental Clinic)
According to our open methodology, this clinic scored 58.9/100 for transparency, reputation, service accessibility, and digital visibility.
Overall rank: #16 of 26 ranked clinics · Last checked: 6 September 2026
58.9/100
Positions by Rating Profile
- Overall Transparency & Trust#1658.9/100
- Best for Expats#1252.8/100
- Best for Dental Implants#1755.5/100
- Best for Emergency Dental Carenot ranked
- Best Price Transparency#1359.5/100
- Best English-speaking Clinicsnot ranked
- Best for Families / Children#1052/100
- Sleep Dentistry (GA / deep sedation)#258.9/100
General Anaesthesia & Deep Sedation
Whether the clinic documents treatment under general anaesthesia or deep / twilight sedation — "sleep dentistry", where the patient is asleep and unaware (does not feel, see, or hear the procedure). Ordinary conscious sedation, where the patient stays awake and responsive, does not count here. This is informational and does not affect the transparency score.
- ✓ General anaesthesia / deep sedation (sleep dentistry) — General anaesthesia / deep sedation documented Filled 2026-09-06 from the clinic's own channel, which is what rule (A) requires here: 'sleep dentistry' is one of the site's five service headings, with pages for sedation implants and dental phobia, the home page states (in translation) 'we operate a sleep-anaesthesia system', and the About page states the practice has extended into 'dental treatment for people with disabilities and dental treatment under general anaesthesia'. The Bookimed profile's separate claim that the clinic is KOIHA-accredited is not repeated anywhere on the clinic's own site and was not used. [w1] [w2]
Summary
Dunsan-district practice operating since 2007 and the Daejeon branch of the two-site DIER group, whose other clinic is in central Daegu. Presented to international patients as an implant, orthodontic and cosmetic dentistry centre.
The site is a single JavaScript-rendered application shared by both DIER branches (dierdg.com/daejeon and dierdg.com/daegu); none of its content was readable without a browser, so treatment lists, dentist names and prices are recorded as unchecked and queued for a manual browser check rather than guessed. The Daegu branch (25 Dongseong-ro, Jung-gu, Daegu, 053-428-5885) is a separate HIRA institution and is not this card.
Strengths
- Information Transparency: 16 of 20 points.
- AI & Search Visibility: 8 of 10 points.
- No red flags identified in public sources.
Weaknesses
No category fell below the weakness threshold (50% of verifiable points).
Score Breakdown
Every criterion below is scored from public sources. ✓ verified yes · ✗ verified no / not found · ◐ partial · ? unverified (scores 0, not a negative finding).
Information Transparency
16 / 20
Whether basic facts about the clinic - its team, premises, services, and location - are publicly verifiable.
| ✓ | Has a working website Updated 2026-09-06. The domain HIRA records, dier.co.kr/daejeon, and the dierdg.com/daejeon it resolved to now both redirect to dier.kr, which is the clinic's current site: its footer publishes Diereu Chigwa-uiwon, business registration 314-27-96299, registered representative Lee Jeong-seong and the card's exact address, 6F Daeil Building, 20 Dunsan-ro, Seo-gu, Daejeon. [w1] [reg1] | 4/4 |
| ✓ | Dentist names listed Filled 2026-09-06 from the clinic's own medical-team tab, which the research pass could not render. Four dentists are named with full credentials: head director Lee Jeong-seong, director Lee Wan-jae, director Lee Geon-yeong and director Gu Hyeon-jeong. [w2] | 3/3 |
| ✓ | Dentist specializations listed Filled 2026-09-06. Two of the four carry a named Ministry of Health and Welfare board specialty - Lee Geon-yeong, Ministry of Health and Welfare board-certified oral and maxillofacial surgeon, and Gu Hyeon-jeong, Ministry of Health and Welfare board-certified orthodontist - and the other two publish their fields (Lee Jeong-seong: accredited by the Korean society of temporomandibular joint and occlusion, lingual orthodontics and implant courses, member of the Korean academies of esthetic dentistry and prosthodontics; Lee Wan-jae: implant and endodontic fellowships, member of the Korean Academy of Geriatric Dentistry). [w2] | 2/2 |
| ? | Real clinic photos Still unresolved. The site is built on the QUV platform and delivers its imagery through CSS background rules rather than <img> elements, so no image can be identified by filename or dimensions from the rendered page; nothing was concluded either way. | 0/2 |
| ✓ | Service list published Filled 2026-09-06. The rendered site publishes a structured service list across five headings - implants, laminates, front-tooth contouring, orthodontics, 'sleep dentistry' (the site's own term for sedation) - each expanding to its own set of pages (full-arch, digital, front-tooth and revision implants; no-prep and front-tooth laminates; diastema, peg lateral and chipped-tooth treatment; clear and lingual aligners; sedation implants, dental phobia and disability dental care). [w1] | 3/3 |
| ✓ | Clear contact details Phone 042-487-7599 and the Dunsan-ro address are published in the HIRA institution register; the clinic-side listing could not be read. [reg1] | 2/2 |
| ✗ | English website version Filled 2026-09-06. The site was read in a browser across the home page, the About / Medical team / Opening hours tabs, the fee page and several service pages: navigation and content are Korean throughout, there is no language switcher, and no anchor points at an /en path. [w1] [w2] [w3] | 0/2 |
| ✓ | Address and map published Street address and WGS84 coordinates published in the HIRA national institution register. [reg1] | 2/2 |
Price Transparency
9 / 15
Whether patients can estimate costs before visiting. Published price ranges count; exact prices are not required.
| ✓ | Prices or price ranges published Filled 2026-09-06. The clinic publishes a non-insured treatment information page under the statutory heading (in translation) 'Non-covered treatment fees are disclosed under Article 45 of the Medical Service Act and Article 42-2 of its Enforcement Rule', and the schedule itself is four images that carry a full itemised table: crowns, core & post, inlays, resin fillings, tooth whitening, document issue, dentures, implants and bone grafting, orthodontics, paediatric, and TMJ & Botox, with a won figure against every line. The research pass could not see it because the site is a JavaScript application and the tables are images. [w3] | 3/3 |
| ✗ | Cleaning price listed The fee table was read in full and has no scaling line. Scaling is a covered benefit in Korea, so its absence from a non-covered schedule is expected. [w3] | 0/2 |
| ✓ | Filling price listed Resin filling: anterior 1 surface 100,000; 2 surfaces 150,000; 3 or more surfaces 200,000; posterior 1 surface 80,000; 2 surfaces 150,000; 3 or more surfaces 300,000 won. [w3] | 2/2 |
| ✓ | Crown price listed Crowns: Gold 600,000; PFM 350,000; zirconia 500,000 anterior / 450,000 posterior; all-ceramic 500,000 won. Inlays and onlays are listed separately (gold inlay 450,000, ceramic inlay 300,000). [w3] | 2/2 |
| ✓ | Implant price listed Implants and bone grafting: DIO PFM 750,000; DIO zirconia 800,000; Osstem zirconia 1,000,000; DIO all-ceramic 900,000; Osstem all-ceramic 1,100,000; DIO Full Arch 8,000,000 per arch; Osstem All-On-X 8,500,000 per arch; standard bone graft 300,000; maxillary sinus bone graft 500,000 won. [w3] | 2/2 |
| ✗ | Consultation price listed The fee table was read in full and carries no consultation or examination line. The nearest entry, orthodontic diagnosis 100,000, is a fee for orthodontic diagnostic records rather than for an appointment. [w3] | 0/2 |
| ✗ | X-ray / imaging price listed The fee table was read in full and carries no imaging line. The document issue section prices copies of existing records (medical record images on CD 10,000, DVD 20,000), which is the fee for a copy, not the price of taking a scan. [w3] | 0/2 |
Reputation & Reviews
10 / 20
Public review signals. The Google rating is adjusted with a Bayesian prior (rating 4.0, weight 25) so a 5.0 from a handful of reviews does not outrank a 4.8 from hundreds.
| ◐ | Google rating (Bayesian-adjusted) Star histogram read live on 2026-09-06 from the place page: 4 five-star, 0 four-star, 0 three-star, 0 two-star, 0 one-star. The buckets sum to 4, matching the 4 in the place-page header exactly, and the weighted mean 5.000 reproduces the published 5. [gmp1] | 4/6 |
| ◐ | Google review volume as of 2026-09-26; previously 4 [dier-dental-daejeon-gbp-2026-09-26] | 0.5/3 |
| ✓ | Review recency The newest review visible is 2 months old, which proves the within-3-months bucket and no better. Sample: the 3 reviews Google Maps renders on the place page in its own relevance order. A newest-first sort was not available; a re-check on the Reviews tab returned the same three reviews, so no fresher slice is available. [gmp1] | 3/3 |
| ✗ | Clinic responds to reviews The Google listing is unclaimed (it offers "Claim this business"), so no owner replies to reviews (read 2026-09-26). [dier-dental-daejeon-gbp-2026-09-26] | 0/2 |
| ✓ | No recurring complaints No low ratings to repeat a complaint: 1★ 0 / 2★ 0 / 3★ 0 / 4★ 0 / 5★ 19 on Google. [dier-dental-daejeon-deepen] | 2/2 |
| ? | No suspicious review patterns | 0/2 |
| ✗ | Active Facebook presence The clinic's Facebook page has had no post since December 2015 and has one review; the clinic's website dier.kr is its working channel. [dier-dental-daejeon-presence] | 0/1 |
| ✗ | TripAdvisor presence No TripAdvisor listing found via its search for "DIER Dental Clinic Daejeon" and "DIER Dental"; the clinic's site does not link to TripAdvisor (checked 2026-10-05). [dier-dental-daejeon-tripadvisor] [dier-dental-daejeon-tripadvisor-2] | 0/0.5 |
| ✓ | Other review platforms Has its own place page on Naver Place, South Korea's main local review platform (551 visitor reviews, 173 blog reviews). [dier-dental-daejeon-platforms] | 0.5/0.5 |
Medical Infrastructure
7.5 / 15
The range of publicly documented equipment and services. This measures documented availability, not clinical quality.
| ? | On-site X-ray | 0/2 |
| ? | CBCT (3D imaging) | 0/2 |
| ✓ | Implantology Implantology is the site's leading service heading, with dedicated pages for full-arch, digital, front-tooth and revision implants, and the fee table prices eleven implant and bone-graft lines. [w1] [w3] | 2/2 |
| ✓ | Orthodontics The site publishes orthodontics with pages for clear aligners, lingual, partial, protrusion and crowded-tooth treatment; the roster names a Ministry of Health and Welfare board-certified orthodontist, Gu Hyeon-jeong; and the fee table prices full ceramic, full lingual, partial and retention treatment. [w1] [w2] [w3] | 2/2 |
| ✓ | Oral surgery The roster names a Ministry of Health and Welfare board-certified oral and maxillofacial surgeon, Lee Geon-yeong, and the fee table prices standard bone grafting and maxillary sinus bone grafting as separate surgical lines. [w2] [w3] | 2/2 |
| ✓ | Pediatric dentistry The fee table carries a paediatric section: sealant 50,000 and fluoride application 10,000 per visit. [w3] | 1.5/1.5 |
| ? | Emergency care | 0/1.5 |
| ? | Works with international patients Same JavaScript-rendered site; third-party medical-travel directories present the clinic to international patients, but that is not a clinic channel. | 0/2 |
Communication & Service
2.5 / 10
How easy it is to contact the clinic, get answers, and book - especially for international patients.
| ? | WhatsApp / LINE available Same JavaScript-rendered site. | 0/2 |
| ? | Response speed | 0/1.5 |
| ? | English spoken Same JavaScript-rendered site. | 0/2.5 |
| ? | Pre-visit consultation possible Same JavaScript-rendered site. | 0/1.5 |
| ✓ | Clear service explanations Filled 2026-09-06. Each service has its own page setting out what the treatment is, who it suits, how the process runs and a frequently-asked-questions block - for example the full-arch implant page explains the digital CT and simulated-surgery planning and the same-day fixed temporary bridge. [w1] | 1/1 |
| ✓ | Convenient opening hours Filled 2026-09-06 from the clinic's own opening hours tab: weekdays to 18:30 with lunch 12:30-14:00, Saturday 09:00-14:00 with no lunch break, Sunday closed, and public holidays by prior appointment. [w2] | 1.5/1.5 |
AI & Search Visibility
8 / 10
Whether the clinic is discoverable when patients search - including via AI assistants. Checked with fixed queries: "best dentist Korea", "English speaking dentist Korea", "dental implants Korea", "emergency dentist Korea", "Korea dental clinic for expats".
| ✓ | Mentioned for: best dentist Korea [sq1] | 1/1 |
| ✗ | Mentioned for: English speaking dentist Korea [sq1] | 0/1 |
| ✓ | Mentioned for: dental implants Korea [sq1] | 1/1 |
| ✓ | Mentioned for: emergency dentist Korea Web search 2026-09-06: named and described ("providing dental care in Daejeon...serves international patients from Asia, North America, Australia, and CIS countries") in the answer for "emergency dentist Daejeon", citing a medicaltourismco.com profile (medicaltourismco.com/clinic/south-korea/daejeon/dier-dental-clinic-daejeon-south-korea/). [sq2] | 1/1 |
| ✓ | Mentioned for: Korea dental clinic for expats Web search 2026-09-06: named first and described in detail ("stress-free dental care with conscious sedation for anxious patients", international patients from Asia, North America, Australia, CIS) in the answer for "Daejeon dental clinic for expats", citing its own site dier.kr. [sq3] | 1/1 |
| ✓ | Structured data on website One schema.org JSON-LD block in the page source. [s1] | 1.5/1.5 |
| ◐ | Google indexing quality dier.kr (matching the clinic's own domain) appears once at position 3, above most directories, but a same-brand Daegu-branch domain and heavy Wikipedia noise surround it (web search 2026-09-07) [giq1] | 1/2 |
| ✓ | Dedicated service pages Filled 2026-09-06: more than thirty distinct service URLs, each on its own path (/full-arch-implant, /digital-implant, /implant-revision, /non-prep-laminate, /clear-aligner, /sleep-implant, /dental-anxiety, /disability-dental-care and so on). [w1] | 1.5/1.5 |
Licensing & Credentials
Whether the clinic publishes its operating licence and the dentists working there together with their professional licence numbers. A verified “not published” is recorded as a red flag; data we have not checked yet is shown as unverified and carries no penalty.
Clinic operating licence: HIRA national health-insurance provider code 34512403 — dental clinic, opened 2007-06-13; as listed in the live Health Insurance Review & Assessment Service institution finder on 2026-09-04. [reg1]
Dentists & professional licences
| Dentist | Specialization | Licence No. |
|---|---|---|
| 이정성 (Lee Jeong-seong, Revised Romanization) [w2] | Director. Chonnam National University School of Dentistry, 2004; certified specialist, Korean Academy of Temporomandibular Joint and Occlusion (2006); lingual-orthodontics and implant course graduate (MINEC periodontal implant basic/advanced, Osstem advanced surgery); member of the Korean Academy of Esthetic Dentistry and the Korean Academy of Prosthodontics. Director of Star White Dental, Daejeon branch, from 2007 and of DIER Dental Clinic since 2009. | not verified |
| 이완재 (Lee Wan-jae, Revised Romanization) [w2] | Director. Yonsei University College of Dentistry; Seoul-Aachen implant fellowship; Seoul National University endodontics fellowship; former clinical instructor to undergraduates at Yonsei University Dental Hospital; former prosthodontic director at Denhouse oral and maxillofacial surgery and director at Severance Dental Clinic; member of the Korean Academy of Geriatric Dentistry. | not verified |
| 이건영 (Lee Geon-yeong, Revised Romanization) [w2] | Director — Ministry of Health and Welfare board-certified oral and maxillofacial surgeon. Kyung Hee University BSc in biology; Pusan National University School of Dentistry; oral and maxillofacial surgery at Yonsei University College of Dentistry; internship at Pusan National University Hospital and residency at Ewha Womans University Seoul Hospital; certified specialist, Korean Society of Maxillofacial Plastic and Reconstructive Surgery. | not verified |
| 구현정 (Gu Hyeon-jeong, Revised Romanization) [w2] | Director — Ministry of Health and Welfare board-certified orthodontist. Kyung Hee University College of Dentistry; internship and orthodontic residency at Kyung Hee University Dental Hospital, later adjunct faculty in its orthodontics department; member of the Korean Association of Orthodontists. | not verified |
Dentists are named; their licence numbers have not been checked against public sources yet — unverified, no penalty.
Red Flags
No red flags identified in the public sources we reviewed.
Data We Could Not Verify
- Information Transparency: Real clinic photos
- Reputation & Reviews: No suspicious review patterns
- Medical Infrastructure: On-site X-ray
- Medical Infrastructure: CBCT (3D imaging)
- Medical Infrastructure: Emergency care
- Medical Infrastructure: Works with international patients
- Communication & Service: WhatsApp / LINE available
- Communication & Service: Response speed
- Communication & Service: English spoken
- Communication & Service: Pre-visit consultation possible
Unverified items score 0 points but are not treated as negative findings. If you can document any of them, please send a correction.
Contact Information
| Website | https://dier.kr/ |
|---|---|
| Phone | +82-42-487-7599 |
| Google Maps | Map listing |
| Address | 대전광역시 서구 둔산로 20, 6층 (둔산동) / 6F, 20 Dunsan-ro, Seo-gu, Daejeon, South Korea |
Contact details are provided for identification only and may change; verify with the clinic directly.
Sources
| ID | Source | What it supports | Accessed |
|---|---|---|---|
| s1 | https://www.dierdg.com/daejeon | Live clinic site for the Daejeon branch (JavaScript-rendered; content not readable in this pass) | 2026-09-04 |
| reg1 | https://www.hira.or.kr/ra/hosp/getHealthMap.do?pgmid=HIRAA030002010000 | HIRA institution record: DIER Dental Clinic, institution code 34512403, dental clinic, Daejeon, Seo-gu, Dunsan-ro 20, 6F, 042-487-7599, opened 2007-06-13, homepage dier.co.kr/daejeon, WGS84 coordinates | 2026-09-04 |
| sq1 | search:best dentist Daejeon / English speaking dentist Daejeon / dental implants Daejeon | AI/search visibility scout 2026-09-04 | 2026-09-04 |
| gmp1 | https://www.google.com/maps/place/%EB%94%94%EC%97%90%EB%A5%B4%EC%B9… | Live Google Maps place page read in a browser: rating, review count, star histogram, review dates, owner replies, listing website, phone, address and pin coordinates | 2026-09-06 |
| w1 | https://dier.kr/ | The clinic's current site, to which the previously recorded dierdg.com/daejeon now redirects: service structure, sedation and disabled-patient dentistry, and a footer carrying the business registration, representative and address | 2026-09-06 |
| w2 | https://dier.kr/52 | The clinic's own 'About / Dentists / Hours / Directions' page: four named dentists with credentials, and the opening hours | 2026-09-10 |
| w3 | https://dier.kr/43 | The clinic's own non-insurance treatment guide page, published under Medical Service Act Article 45, carrying the itemised non-covered fee tables as images | 2026-09-06 |
| sq2 | search:emergency dentist Daejeon | AI/search visibility scout — canonical query | 2026-09-06 |
| sq3 | search:Daejeon dental clinic for expats | AI/search visibility scout — canonical query | 2026-09-06 |
| giq1 | search:디에르치과 대전 DIER Dental Clinic Daejeon | dier.kr (matching the clinic's own domain) appears once at position 3, above most directories, but a same-brand Daegu-branch domain and heavy Wikipedia noise surround it | 2026-09-07 |
| dier-dental-daejeon-gbp-2026-09-26 | https://www.google.com/maps?cid=4475938801389425563&hl=en | Google listing read on 2026-09-26: rating 5 from 16 reviews; star histogram 1★ 0 / 2★ 0 / 3★ 0 / 4★ 0 / 5★ 16; newest review dated 2026-09-23; the listing is unclaimed (it offers "Claim this business"). | 2026-09-26 |
| dier-dental-daejeon-platforms | https://m.place.naver.com/hospital/11889029/home | Naver Place page of DIER Dental Clinic, Daejeon Dunsan branch (category: dentist), Daeil Building 6F, 20 Dunsan-ro, Seo-gu, Daejeon — the clinic's address: 551 visitor reviews (456 with text, 90 with a rating), 173 blog and cafe reviews; phone 0507-1370-7599, a Naver forwarding number ending in the clinic's 7599 (checked 2026-10-01) | 2026-10-01 |
| dier-dental-daejeon-presence | https://www.facebook.com/dierdj/ | Facebook page "DIER Dental" (535 followers), read 2026-10-02; newest post 2015-12-24; Not yet rated (1 review); address Dunsan-dong 1072, Daeil Building 6F, Seo-gu, Daejeon (given in Korean); phone +82 42-487-7599; page name given in Korean | 2026-10-02 |
| dier-dental-daejeon-deepen | https://www.google.com/maps?cid=4475938801389425563&hl=en | Google listing (Dentist, unclaimed), read 2026-10-02 in four review orders (newest, lowest-rated, most relevant, highest-rated first): 5.0 from 19 reviews (1★ 0 / 2★ 0 / 3★ 0 / 4★ 0 / 5★ 19); 9 distinct reviews read, dated 2021-11-07 to 2026-09-30 | 2026-10-02 |
| dier-dental-daejeon-tripadvisor | https://www.tripadvisor.com/TypeAheadJson?action=API&details=true&q… | TripAdvisor's own search, read 2026-10-05: 12 suggestions for "DIER Dental Clinic Daejeon" (6 attractions, 6 hotels), none of them a dental practice in or near Daejeon; 12 suggestions for "DIER Dental" (1 place, 4 attractions, 6 hotels, 1 restaurant), none of them a dental practice in or near Daejeon; no listing for this clinic | 2026-10-05 |
| dier-dental-daejeon-tripadvisor-2 | https://dier.kr/ | Clinic's website, home page read 2026-10-05: no link to a TripAdvisor page | 2026-10-05 |
Change History
| Date | Change |
|---|---|
| 2026-10-05 | TripAdvisor presence checked on 2026-10-05: no listing found for this clinic. |
| 2026-10-02 | Read 9 of the clinic's Google reviews on 2026-10-02: no repeated complaint. |
| 2026-10-02 | Facebook presence re-checked on 2026-10-02: the clinic's Facebook page is inactive. |
| 2026-09-29 | Corrected 2026-09-29: no recurring complaints and no suspicious review patterns now unverified: 4 Google reviews are too few to show a pattern; review count 16 (was 4) from the Google listing on 2026-09-26; no owner replies to reviews: the Google listing is unclaimed. |
| 2026-09-10 | Name-verification write-back 2026-09-10: 4 dentists confirmed on the clinic's own roster page https://dier.kr/52; sources added. |
| 2026-09-06 | Checked by hand in a browser: Google Maps place page read live; the clinic's site, which the research pass could not render at all, opened in a browser - dierdg.com now redirects to dier.kr - yielding four named dentists with credentials, the service structure, the opening hours and the full itemised non-covered fee table, and settling the sedation question on the clinic's own channel rather than on the aggregator profile. |
| 2026-09-04 | Initial data collection for the Korea Dental Transparency & Trust Index: institution verified in the HIRA national register; the clinic's own site is JavaScript-rendered and its content is queued for a manual browser check. |
A question or a correction?
Have a question, a suggestion, or a correction to this page? Get in touch — we read every message. Verified data corrections are reviewed against sources and applied with a public change-history entry.